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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
segment
item
state
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Number of operating states | state 17    
Number of operating segments | segment 5    
Earnest money deposits $ 56.8 $ 30.6  
Number of communities impairment charges | item 1 4  
Impairment of real estate   $ 2.2  
Non-refundable cash deposits classified in prepaid expenses and other assets $ 38.1 31.3  
Advertising and marketing costs 7.7 11.3 $ 17.0
Accrual for incurred but not reported construction defect claims 5.1 0.0  
Tax valuation allowance 0.0 0.0  
Reserves for uncetain tax positions 0.0 0.0  
Goodwill impairment $ 0.0 $ 0.0  
Model Homes And Sales Facilities [Member] | Minimum [Member]      
Estimated useful life 2 years    
Model Homes And Sales Facilities [Member] | Maximum [Member]      
Estimated useful life 3 years